The "Gherkin", the City of London's landmark Swiss Re Tower, has won a prestigious architecture award.
The favourite, officially called 30 St Mary Axe, took the Royal Institute of British Architects (RIBA) Stirling Prize on a unanimous vote by judges.
The prize honours the building making the greatest contribution to British architecture in the past year.
Five other new buildings were short listed for the £20,000 award, presented in London on Saturday night.
The judges, who for the first time in the award's nine-year history made a unanimous decision, said the building was "already a popular icon".
It had an "elegant and impressive" entrance, while the top-floor bar would be "one of the very best rooms in 21st Century London", they added.
Other contenders alongside Lord Foster's building were The Imperial War Museum North in Manchester, a specialist school in Bexley, London, and Coventry's city centre redevelopment.
Dublin's Spire monument and the Kunsthaus arts centre
in Graz, Austria, were also nominated.
The award covers buildings in Britain or designed by a British architect anywhere in the European Union.
Previous winners include the Gateshead Millennium Bridge and a multi-coloured London dance centre.
The prize is named after the architect Sir James Stirling, who died in 1992.
Other winners at this year's ceremony included the City of Manchester stadium, designed by Arup Associates.
It won the RIBA Inclusive Design Award for great design in a safe and convenient environment.
HOK International Ltd won the Crown Estate Conservation Award for their restoration of the King's Library at the British Museum.
The City of Manchester stadium also won an award
Stock Orchard Street, a green residential project beside King's Cross Station in central London, designed by Sarah Wigglesworth, won the RIBA Sustainability
A rubber-clad beach house called Vista on Dungeness Beach won the Stephen Lawrence Prize for the best construction with a budget under £350,000.